auth: use all sshPubKeys for disk unlock, fix tests, fix hm config

After this has been tested successfully, root SSH login can be disabled.

The advantages of having a user for each adminstrator:

* Better security analysis: who issued executed what command, who
  touched which file, who used sudo at which time.
* Possibility of granular access, e.g. person X is only allowed to
  manage service Y

hosts/blue-shell/wireguard.nix

@@ -22,7 +22,7 @@ in
         "${wireguardIPv6}/96"
       ];
       privateKeyFile = config.age.secrets.wg-private-key.path;
-      peers = flake.self.logins.admins.wireguardDevices ++ [
+      peers = flake.self.logins.wireguardDevices ++ [
         {
           # trinkgenossin.pub.solar
           publicKey = "QWgHovHxtqiQhnHLouSWiT6GIoQDmuvnThYL5c/rvU4=";

hosts/delite/wireguard.nix

@@ -22,7 +22,7 @@ in
         "${wireguardIPv6}/96"
       ];
       privateKeyFile = config.age.secrets.wg-private-key.path;
-      peers = flake.self.logins.admins.wireguardDevices ++ [
+      peers = flake.self.logins.wireguardDevices ++ [
         {
           # trinkgenossin.pub.solar
           publicKey = "QWgHovHxtqiQhnHLouSWiT6GIoQDmuvnThYL5c/rvU4=";

hosts/metronom/wireguard.nix

@@ -18,7 +18,7 @@
         "fd00:fae:fae:fae:fae:3::/96"
       ];
       privateKeyFile = config.age.secrets.wg-private-key.path;
-      peers = flake.self.logins.admins.wireguardDevices ++ [
+      peers = flake.self.logins.wireguardDevices ++ [
         {
           # nachtigall.pub.solar
           endpoint = "138.201.80.102:51820";

hosts/nachtigall/wireguard.nix

@@ -18,7 +18,7 @@
         "fd00:fae:fae:fae:fae:1::/96"
       ];
       privateKeyFile = config.age.secrets.wg-private-key.path;
-      peers = flake.self.logins.admins.wireguardDevices ++ [
+      peers = flake.self.logins.wireguardDevices ++ [
         {
           # tankstelle.pub.solar
           endpoint = "80.244.242.5:51820";

hosts/tankstelle/wireguard.nix

@@ -18,7 +18,7 @@
         "fd00:fae:fae:fae:fae:4::/96"
       ];
       privateKeyFile = config.age.secrets.wg-private-key.path;
-      peers = flake.self.logins.admins.wireguardDevices ++ [
+      peers = flake.self.logins.wireguardDevices ++ [
         {
           # nachtigall.pub.solar
           endpoint = "138.201.80.102:51820";

hosts/trinkgenossin/wireguard.nix

@@ -22,7 +22,7 @@ in
         "${wireguardIPv6}/96"
       ];
       privateKeyFile = config.age.secrets.wg-private-key.path;
-      peers = flake.self.logins.admins.wireguardDevices ++ [
+      peers = flake.self.logins.wireguardDevices ++ [
         {
           # nachtigall.pub.solar
           endpoint = "138.201.80.102:51820";

logins/default.nix

@@ -6,19 +6,16 @@ in
 {
   flake = {
     logins = {
-      admins =
-        lib.lists.foldl
-          (logins: adminConfig: {
-            sshPubKeys = logins.sshPubKeys ++ (lib.attrsets.attrValues adminConfig.sshPubKeys);
-            wireguardDevices =
-              logins.wireguardDevices
-              ++ (if adminConfig ? "wireguardDevices" then adminConfig.wireguardDevices else [ ]);
-          })
-          {
-            sshPubKeys = [ ];
-            wireguardDevices = [ ];
-          }
-          (lib.attrsets.attrValues admins);
+      admins = admins;
+      wireguardDevices = lib.lists.foldl (
+        wireguardDevices: adminConfig:
+        wireguardDevices ++ (if adminConfig ? "wireguardDevices" then adminConfig.wireguardDevices else [ ])
+      ) [ ] (lib.attrsets.attrValues admins);
+      sshPubKeys = lib.lists.foldl (
+        sshPubKeys: adminConfig:
+        sshPubKeys
+        ++ (if adminConfig ? "sshPubKeys" then lib.attrsets.attrValues adminConfig.sshPubKeys else [ ])
+      ) [ ] (lib.attrsets.attrValues admins);
       robots.sshPubKeys = lib.attrsets.attrValues robots;
     };
   };

modules/core/default.nix

@@ -54,9 +54,5 @@
     };
 
     time.timeZone = "Etc/UTC";
-
-    home-manager.users.${config.pub-solar-os.authentication.username} = {
-      home.stateVersion = "23.05";
-    };
   };
 }

modules/core/terminal-tooling.nix

@@ -1,6 +1,11 @@
-{ flake, config, ... }:
+{ flake, lib, ... }:
 {
-  home-manager.users.${config.pub-solar-os.authentication.username} = {
+  home-manager.users = (
+    lib.attrsets.foldlAttrs (
+      acc: name: value:
+      acc
+      // {
+        ${name} = {
           programs.git.enable = true;
           programs.starship.enable = true;
           programs.bash.enable = true;
@@ -17,3 +22,6 @@
           };
         };
       }
+    ) { } flake.self.logins.admins
+  );
+}

modules/core/users.nix

@@ -11,18 +11,6 @@
       inherit (lib) mkOption types;
     in
     {
-      username = mkOption {
-        description = "Username for the adminstrative user";
-        type = types.str;
-        default = flake.self.username;
-      };
-
-      sshPubKeys = mkOption {
-        description = "SSH Keys that should have administrative root access";
-        type = types.listOf types.str;
-        default = flake.self.logins.admins.sshPubKeys;
-      };
-
       root.initialHashedPassword = mkOption {
         description = "Hashed password of the root account";
         type = types.str;
@@ -43,22 +31,29 @@
     };
 
   config = {
-    users.users.${config.pub-solar-os.authentication.username} = {
-      name = config.pub-solar-os.authentication.username;
-      group = config.pub-solar-os.authentication.username;
+    users.users =
+      (lib.attrsets.foldlAttrs (
+        acc: name: value:
+        acc
+        // {
+          ${name} = {
+            name = name;
+            group = name;
             extraGroups = [
               "wheel"
               "docker"
             ];
             isNormalUser = true;
-      openssh.authorizedKeys.keys = config.pub-solar-os.authentication.sshPubKeys;
+            openssh.authorizedKeys.keys = lib.attrsets.attrValues value.sshPubKeys;
           };
-    users.groups.${config.pub-solar-os.authentication.username} = { };
-
+        }
+      ) { } flake.self.logins.admins)
+      // {
         # TODO: Remove when we stop locking ourselves out.
-    users.users.root.openssh.authorizedKeys.keys = config.pub-solar-os.authentication.sshPubKeys;
+        root.openssh.authorizedKeys.keys = flake.self.logins.sshPubKeys;
+        root.initialHashedPassword = config.pub-solar-os.authentication.root.initialHashedPassword;
 
-    users.users.${config.pub-solar-os.authentication.robot.username} = {
+        ${config.pub-solar-os.authentication.robot.username} = {
           description = "CI and automation user";
           home = "/home/${config.pub-solar-os.authentication.robot.username}";
           createHome = true;
@@ -68,11 +63,28 @@
           isSystemUser = true;
           openssh.authorizedKeys.keys = config.pub-solar-os.authentication.robot.sshPubKeys;
         };
+      };
 
-    users.groups.${config.pub-solar-os.authentication.robot.username} = { };
+    home-manager.users = (
+      lib.attrsets.foldlAttrs (
+        acc: name: value:
+        acc
+        // {
+          ${name} = {
+            home.stateVersion = "23.05";
+          };
+        }
+      ) { } flake.self.logins.admins
+    );
 
-    users.users.root.initialHashedPassword =
-      config.pub-solar-os.authentication.root.initialHashedPassword;
+    users.groups =
+      (lib.attrsets.foldlAttrs (
+        acc: name: value:
+        acc // { "${name}" = { }; }
+      ) { } flake.self.logins.admins)
+      // {
+        ${config.pub-solar-os.authentication.robot.username} = { };
+      };
 
     security.sudo.wheelNeedsPassword = false;
   };

modules/unlock-luks-on-boot/default.nix

@@ -10,7 +10,7 @@
 
       # Please create this manually the first time.
       hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ];
-      authorizedKeys = config.pub-solar-os.authentication.sshPubKeys;
+      authorizedKeys = flake.self.logins.sshPubKeys;
     };
     postCommands = ''
       # Automatically ask for the password on SSH login

modules/unlock-zfs-on-boot/default.nix

@@ -11,7 +11,7 @@
 
       # Please create this manually the first time.
       hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ];
-      authorizedKeys = config.pub-solar-os.authentication.sshPubKeys;
+      authorizedKeys = flake.self.logins.sshPubKeys;
     };
     # this will automatically load the zfs password prompt on login
     # and kill the other prompt so boot can continue

tests/keycloak.nix

@@ -66,7 +66,7 @@ in
   testScript =
     { nodes, ... }:
     let
-      user = nodes.client.users.users.${nodes.client.pub-solar-os.authentication.username};
+      user = nodes.client.users.users.b12f;
       #uid = toString user.uid;
       bus = "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(id -u ${user.name})/bus";
       gdbus = "${bus} gdbus";

tests/support/client.nix

@@ -11,7 +11,7 @@
   services.xserver.displayManager.gdm.enable = true;
   services.xserver.desktopManager.gnome.enable = true;
   services.xserver.displayManager.autoLogin.enable = true;
-  services.xserver.displayManager.autoLogin.user = config.pub-solar-os.authentication.username;
+  services.xserver.displayManager.autoLogin.user = "b12f";
 
   systemd.user.services = {
     "org.gnome.Shell@wayland" = {